Love this thread. A pressure shift in a baseball swing is vital if you want any power. The weight back part that you see in a high level swing (knee behind the foot, hip behind the knee, shoulders behind the hips) is a shallowing out technique that flattens out the swing arc with proper arm work. In some swings you will see the hips going forward ahead of the shoulders during their stride, in others hitters use lower back extension (belt forward) while keeping the head steady. Good hitters are not falling back at contact. And virtually all high level hitters do have weight going forward during their stride. The load in baseball is a weight and a pressure shift to the back foot.
I can only speak for myself but the issues I had revolved around weight shift and pressure. Erik can probably get into more detail but Pujols weight below at impact is much different than Tiger's at impact.
You can get away with the Pujols position MAYBE with the driver (not even really) but with irons, not a chance. To hit the ball before the turf on impact with the golf swing, the way weight and pressure moves in the baseball swing is completely different and doesn't translate to the golf swing well. Also, look at Pujols wrist hands vs. Tigers.